[Trap]

Thought I'd share a picture and a FR graph of my first attempt at an OB speaker (well almost OB speaker as the bass module is in a CB). First off, I'd like to thank matevana for sharing his Hestia project; It was due to that project that I used the MCM 55-2981 for the mid; presently this is an active 3w with crossover points @ 80, 1000, LR24. The 10" bass driver (Dayton Audio RS270-8) is in a CB with Q box of around .6, mid driver is the 10" MCM 55-2981 covering 80 to 1000 and the top end is cover by the CSS EL-70 which I had on hand; a little bit of massaging the response with the DCX-2496 provided the below response in room at 8 ft. Unfortunately, my stereo room is partially being used for storage so I'm running just this single speaker (with a summed mono signal) for now;I'm sure the next version will have a tweeter on top for an active 4W.








BTW, the above SPL scale is just relative.

Looking forward to reclaiming my stereo room and running a pair; even this single speaker has a very large open sound with great dynamics.

Thanks for taking a look and Best Regards....Trap

 

[mluc8]

Did you already have the CB or did you build that as part of the project? Does the OB integrate well with the CB and how is the sound overall? Nice looking build btw.

[underdawg]

nice looking build , i agree the tweeter would be beneficial.

[Trap]

Did you already have the CB or did you build that as part of the project? Does the OB integrate well with the CB and how is the sound overall? Nice looking build btw.

thanks..yes I had the sealed bass bin, they were part of a 3w with a TB-704 as the mid (also in a sealed enclosure) and a Vifa DQ25SC16 tweeter; I really liked the TB-704 for the midrange, poly cone, very smooth and natural sound.

I think the OB integrates very well, there's nothing in the presentation that seems wrong to me; I must add I've never heard a FR OB design so I really don't have anything to compare it too; it would be cool to do a side by side comparison; I initially had the XO from mid to bass bin at 80HZ but have since moved it to 120; since I have just the single speaker running, the 80 hz XO was a bit too low at high spl levels; started to sound stressed. I'm also crossing 1st order electrical (which gives about a 2nd order acoustical according to PCD) now from mid to upper.

It looks like I'm an OB man from this point on.

this is the room response with the 1st order XO at 1000hz:

[Trap]

I haven't done much with these outside of including a cheap tweeter I had; I'm going to put my efforts into building two units using my present bass bins for the lowend for now and using the new B&G NEO3's I just purchased; I want to make the baffles as narrow as possible for each driver with the hopefull goal of acquiring the best CD; I purchased the mounting flanges for the NEO3's but maybe I won't use them, not sure right now.
 

[studiotech]

Looks great for a first try!  The downward slope you are getting at 8ft is good.  Make sure to keep that going even once you add the tweeter.  Getting flat response at the listening position can be a little bright and fatiguing.

Greg

[Trap]

Looks great for a first try! 

Thanks

The downward slope you are getting at 8ft is good.  Make sure to keep that going even once you add the tweeter.  Getting flat response at the listening position can be a little bright and fatiguing

Yea, I agree it can be fatiguing, it's easy to do with the DCX2496 I'm using, eq the individual channels for flat response, then eq the L & R inputs to have a downward slope of your choice.